*{ margin: 0; padding: 0;}
#slisder {width: 1000px; height: auto; margin: 100px auto; overflow:hidden; position: relative;}
.pic_box { position: absolute; list-style: none; width: 100%;}
.pic_box li {width: 1000px;display: block;}
.pic_box li a { display: block;}
.pic_box li a img { width: 100%;}